io.github.ryanthegentry/402index
Search 15,000+ paid API endpoints across the L402, x402, and MPP protocols on 402index.io
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402 Index MCP Server
Search 15,000+ paid API endpoints across L402, x402, and MPP protocols with real-time health monitoring.
The 402 Index is the world's largest directory of paid API endpoints for AI agents. This MCP server gives your agent access to search, filter, and evaluate paid APIs before spending money.
Quick Start
npm install -g @402index/mcp-server
mcp-server
Installation
Claude Code
npm install -g @402index/mcp-server
claude mcp add 402index -- mcp-server
Claude Desktop
Install the server, then add to ~/Library/Application Support/Claude/claude_desktop_config.json:
npm install -g @402index/mcp-server
{
"mcpServers": {
"402index": {
"command": "mcp-server"
}
}
}
Cursor
Install the server, then add to .cursor/mcp.json:
npm install -g @402index/mcp-server
{
"mcpServers": {
"402index": {
"command": "mcp-server"
}
}
}
Cline
Install the server, then add to your Cline MCP settings:
npm install -g @402index/mcp-server
{
"mcpServers": {
"402index": {
"command": "mcp-server"
}
}
}
Tools
| Tool | Description |
|---|---|
search_services | Search 15,000+ paid APIs by keyword, protocol (L402/x402/MPP), category, health status, price, and more |
get_service_detail | Full details for a service including health history, latency, pricing, and payment verification |
list_categories | Browse all API categories with per-protocol endpoint counts |
get_directory_stats | Directory-wide health stats, protocol breakdown, and sync timestamps |
Token-Optimized Defaults (v0.2.0)
Responses are compact by default to minimize token usage in agent workflows:
search_servicesreturns 10 results with 5 fields (name,url,protocol,price_sats,health_status) by defaultfieldsβ Comma-separated field names to return, or*for all 20 fieldsformatβjson(default) orcsvfor tabular output (~29% fewer tokens)limitβ Results per page (default 10, max 200)
list_categoriesreturns a flat[{name, count}]array by defaultsummaryβtrue(default) for compact output,falsefor full protocol breakdown
What Can Your Agent Discover?
- L402 (Lightning) β Self-custodial Bitcoin micropayments. 477 endpoints from providers like mutinynet faucet, sats4ai, LightningEnable.
- x402 (Coinbase/Solana) β USDC stablecoin payments on Base/Solana. 14,478 endpoints from Bazaar, Satring, Sponge.
- MPP (Stripe/Tempo) β Fiat-native machine payments. 488 endpoints from OpenAI, Anthropic, Google Gemini, Firecrawl, Replicate.
Every endpoint is health-checked hourly with latency measurements and reliability scoring.
Example Prompts
- "Find healthy L402 APIs for weather data under $0.01"
- "What paid inference APIs are available and which have the best uptime?"
- "Show me all podcast-related paid APIs"
- "Which API categories have the most endpoints?"
- "Get details on the sats4ai image generation endpoint"
Environment Variables
| Variable | Default | Description |
|---|---|---|
INDEX_URL | https://402index.io | Base URL of the 402 Index API |
Links
- Website: https://402index.io
- API Docs: https://402index.io/api-docs
- OpenAPI Spec: https://402index.io/api/v1/openapi.json
- llms.txt: https://402index.io/llms.txt
- npm: https://www.npmjs.com/package/@402index/mcp-server
License
MIT
